198,101 research outputs found
Kochen-Specker theorem for von Neumann algebras
No full textThe Kochen-Specker theorem has been discussed intensely ever since its original proof in 1967. It is one of the central no-go theorems of quantum theory, showing the non-existence of a certain kind of hidden states models. In this paper, we first offer a new, non-combinatorial proof for quantum systems with a type I_n factor as algebra of observables, including I_infinity. Afterwards, we give a proof of the Kochen-Specker theorem for an arbitrary von Neumann algebra R without summands of types I_1 and I_2, using a known result on two-valued measures on the projection lattice P(R). Some connections with presheaf formulations as proposed by Isham and Butterfield are made
Fino, Bouillon-Würfel in Qualität unübertroffen, Luithlen & Neumann, Andernacher Dörrgemüse, Conservenfabrik, Andernach A/R.
No full textFINO, BOUILLON-WÜRFEL IN QUALITÄT UNÜBERTROFFEN, LUITHLEN & NEUMANN, ANDERNACHER DÖRRGEMÜSE, CONSERVENFABRIK, ANDERNACH A/R.
Fino, Bouillon-Würfel in Qualität unübertroffen, Luithlen & Neumann, Andernacher Dörrgemüse, Conservenfabrik, Andernach A/R. ( -
Convergence of infinite products of matrices and inner-outer iteration schemes
No full textElsner L, Bru R, Neumann MM. Convergence of infinite products of matrices and inner-outer iteration schemes. Electronic Transactions on Numerical Analysis. 1994;2:183-193
Fino, Delikatester Hühnerbouillon-Würfel aus garantiert reinem Hühnerfleisch, Luithlen & Neumann, Andernacher Dörrgemüse, Conservenfabrik, Andernach A/R.
No full textFINO, DELIKATESTER HÜHNERBOUILLON-WÜRFEL AUS GARANTIERT REINEM HÜHNERFLEISCH, LUITHLEN & NEUMANN, ANDERNACHER DÖRRGEMÜSE, CONSERVENFABRIK, ANDERNACH A/R.
Fino, Delikatester Hühnerbouillon-Würfel aus garantiert reinem Hühnerfleisch, Luithlen & Neumann, Andernacher Dörrgemüse, Conservenfabrik, Andernach A/R. ( -
Equilibrio competitivo y soportes del crecimiento en el modelo de Von Neumann
No full textThis paper shows the existence of a reproducible competitive equilibrium in the general Von Neumann growth model, extending in this way a result due to Roemer.
Structural analysis of the PCL-R and relationship to BIG FIVE personality traits and parenting characteristics in an Hispanic female offender sample
No full textValid measurement of psychopathic traits in females using the Psychopathy Checklist Revised (PCL-R) continues to be an under researched topic. Previous latent variable and other psychometric studies have raised questions concerning the structure and predictive effects of psychopathic traits in females. New cross-cultural research finds good support for a four-factor model of psychopathy in females and the predictive effects of the psychopathy factors (Declercq, Carter, & Neumann, 2015; Neumann, Hare, & Pardini, 2015). Nevertheless, additional research is needed on females, especially individuals from diverse cultural backgrounds. We investigated the factor structure and construct validity of the PCL-R in a female Hispanic sample (n = 155). Confirmatory factor analysis showed that the four-factor model provided an adequate fit. Furthermore, structural equation modelling revealed significant negative and positive predictive effects, respectively, between general personality (Agreeableness and Conscientiousness), and indifferent/abusive parenting with the broad syndrome of psychopathy
The Man from the Future: The Visionary Life of John von Neumann
No full textLe chapitre intitulé « Johnny » de l’autobiographie inachevée de Klári von Neumann (née Klára Dán), la seconde épouse de Johnny von Neumann, débute ainsi : « I would like to tell about the man, the strange contradictory and controversial person; childish and good-humoured, sophisticated and savage, brilliantly clever yet with a very limited, almost primitive lack of ability to handle his emotions – an enigma of nature that will have to remain unresolved. » Tenter de cerner l’insaisissable Johnny von Neumann à travers une exploration de son œuvre intellectuelle et des véritables révolutions scientifiques que celle-ci initia est le défi que s’est fixé le londonnien Ananyo Bhattacharya, et ce dès sa toute première expérience comme biographe et auteur. Considérant l’incroyable envergure de la contribution de von Neumann à l’avancement de la science, nul biographe ne peut prétendre avoir une maîtrise complète de toutes les subtilités de l’entièreté des sujets devant être traités. Diplômé en physique de University of Oxford, titulaire d’un PhD obtenu au Imperial College London et fort d’une expérience comme journaliste scientifique chez The Economist et Nature, Bhattacharya fait la démonstration dans The Man from the Future: The Visionary Life of John von Neumann qu’il est qu’adéquatement outillé pour relever le défi
A comparison of deflation and the balancing Neumann-Neumann preconditioner
No full textIn this paper we compare various preconditioners for the numerical solution of partial differential equations. We compare the well-known balancing Neumann Neumann preconditioner used in domain decomposition methods with a so-called deflation preconditioner. We prove that the effective condition number of the deflated preconditioned system is always, i.e. for all deflation vectors and all restrictions and prolongations, below the condition number of the system preconditioned by the balancing Neumann-Neumann preconditioner. Even more, we establish that both preconditioners lead to almost the same spectra. The zero eigenvalues of the deflation preconditioned system are replaced by eigenvalues which are one if the balancing Neumann-Neumann preconditioner is used. Moreover, we proved that the A-norm of the errors of the iterates build by the deflation preconditioner is always below the A-norm of the errors of the iterates build by the balancing Neumann-Neumann preconditioner. Additionally, the amount of work of one iteration of the de ation preconditioned system is less than the amount of work of one iteration of the balancing Neumann-Neumann preconditioned system. Finally, we establish that the deflation preconditioner and the balancing Neumann-Neumann preconditioner produces the same iterates if one uses certain starting vectors. Numerical results for porous media flows emphasize the theoretical results.Electrical Engineering, Mathematics and Computer Scienc
Three nontrivial solutions for the p-Laplacian Neumann problems with a concave nonlinearity near the origin
No full textWe consider a nonlinear Neumann problem driven by the p-
Laplacian, with a right-hand side nonlinearity which is concave near the
origin. Using variational techniques, combined with the method of upper-lower
solutions and with Morse theory, we show that the problem has at least three
nontrivial smooth solutions, two of which have a constant sign (one positive
and one negative).FCTPOCI/MAT/55524/200
Book review: radicalized: new jihadists and the threat to the West by Peter R. Neumann
No full textIn Radicalized: New Jihadists and the Threat to the West, Peter R. Neumann explores the phenomenon of the ‘new jihadists’ travelling from the West to join and/or train with ‘Islamic State’ and reflects on the scale of the threat this poses to Western nations. While more on the role of women within the movement and analysis of a wider range of European examples would have been welcome, this meticulously researched and engagingly written book is highly recommended by Jennifer Philippa Eggert
- …
